Because the frequency of No.2 is the highest, it is deduced from No.2, but it can be concluded that ad is contradictory after a little reasoning. Suppose D says that Huashan No.2 is right and the two sentences of A are wrong, then the second half of D is right and Hengshan No.4 is wrong, then the first half of E is right and 1 is Mount Tai, then the first half of A is wrong and Huashan No.3 is wrong, then the first half of C is wrong and Hengshan No.5 is wrong.